<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>列表</title>
</head>
<style>
    ul{
        /*列表样式的类型(列表符号)*/
        list-style-type: circle;
        /*列表符号的位置*/
        list-style-position: outside;/*inside-在li里面、outside-在li外面*/
        /*自定义列表符合*/
        /*list-style-image: url("");*/

      /*复合属性*/
        /*list-style: outside circle;*/
    }
    li{
        background-color: cadetblue;
    }
</style>
<body>
    <ul>
        <li>123</li>
        <li>234</li>
        <li>345</li>
    </ul>
</body>
</html>